Elastic-fluid turbine.



- ful Elastic-Fluid Turbine, of Which the folnnrrnnsmrns.

PATENT orrron f..

,MixA Korres, or .MiLWAUKen wiseesem.;`

. CHALMERS COMPANY-,- OF- MILWAUKEE,

RATION OFNEW JERSEY.

ELASTIC-FLUID .Toy all whom, it may concern;

Be it'knoWn that l, MAX ROTTER, a citizen of the United States, residing at Milwaukee, 1n Ithe count;r of lVlilWaukee,V and State' of Wisconsln, have invented a certain new and uselowing is'a specification.

invention realtes to elastic-fluid turbines,ai`1d s ecically to a-shroud member IO' uniting 'the lades and ada and contract under the uence of variations of temperature Without' disturbing the almement f the blades.

A In the accompanying drawings, Which form a part of this-specification and which illusted to expand trate an embodiment of the invention, and in which the same reference characters are used to indicate the same elements in each of the several views, Figure l is a vertical vtransverse section of the rotor of a steam-turbine, lshowing a ring of blades and a shroud memi -.-,b'e"r. embodying my invention attached there- 1 to."""Fig'. 2 1s a plan view of a shroud member,

showin the blades attached thereto.

Fig. 3 is ane evation of a blade with the shroud member shown in Fig. 2 attached thereto,

' the shroud member being shown in section.

Fig. 4 is a plan view of a shroud member, ,showing a modification in the manner of fblming said member; and Fig. 5 is an elevaiofn of a blade and shroud member attached thereto, the shroud member being shown in section.

' In elastic-fluid turbines', especially those using a highly-heated gas, such as superheated steam, 'for the motive fluid, a considerable amount of expansion of certain parts of the turbine should be provided for.

'As shown in Fig. l, Which illustrates a modern construction of turbine, the blades b are mounted upon a blade-carrying drum B, and the outer ends of the blades are united by a shroud member s.

The blade-carrying drum B is usually comosed of iron or steel, While the blades b and .trhe shroud member s are made of brass or some such material Which has a rather high coefficient of expansion.

It is obvious Jfrom an inspection of the'turbine as shown by Fig. l that the length of the shroud member s is relatively very great Specification of .Letters Patent. i Application ilediuly l2, 1966. lSerial No. 325,747.

Assreivoef 'ro' entre; Wisconsin, e coero- TLIRBINE .ratented vNov. 6, 1996.

ber s is not 'provided for by an equal expansion or contraction the blades b, this difiero the shroud member s and the blades b being liable to alter the position of the blades.

In Figs. Zend 4 is shown a Way to permit the shroudv member s to expand and contract Without disturbing the blades or changing their relative positions. The shroud member s is provided With slits or slots p, which are either disposed at right angles toits length, as shown in Fig. 2, or at some angle other than a right angle to its length, as shown in Fig. fi. f lin Figs. 2 to 5, inclusive, the reference character t shows the projection upon the end oi eaeh blade securing the shroud member to the blades. lt will be 'understood that this shroud member, arranged to permit of excessive expansion and contraction, is equally applicable to the blades secured to the stator member as it is to the blades secured to the rotor member, such as shown in Fig. i; but to avoid unnecessary illustration it is deemed its relation to the blades carried by the rotor member, as shown in Fig. 1.

lt Will be noticed by reference to Figs. 2 and l that the slots i extend from either side oi 'the shroud member into said membera sufficient distance to allow for relative movement between the different partsl of the shroud member. y

The shroud member s is shown as made Jfrom a channel-bar, and the slots p are shown as extending practically through the lbar to the farthermost Web. The action or the shroud membery under the influence of a rise ol temperature is to d1- minish the Width of the slots .in case'A the blades do not expand sufficiently in a direction radial to the axis of the turbine to comensate for the'expansion ofthe shroud memiier. lf, on the contrary, the blades are so long as to more than compensate for the expansion of the shroud member, then the width ol the slots Would be increased.

The slits or slots need not be arranged, as

7 as compared Withfthe total length of tyvo .dia-

metrically located blades, so that the total v 'expansion or contraction of the shroud memence between the total amount of expansion sulicient to show the shroud member only in ICQ shown in Figs. V2 and 4, between every two blades, but may be placed at intervals and separated by a plurality of blades.

1. The combination with a blade-holding member of blades secured thereto and a uni tary member connecting said blades, said unitary member bein so constructed and arranged as to permit o? relative movement between diierent parts thereof when subjected to variations of temperature.

2. The combination with a blade-holding member of blades secured thereto and a member connecting the blades, said latter member being slotted to diminish the eeots of variations of temperature thereon.

3. The combination with a blade-holding member of blades secured thereto and a member connecting the blades, said member being provided with transverse slots to diminish the effects of variations of temperature thereon.

4. The combination with a blade-holding member of blades secured thereto and a member connecting the blades, said member being rovided with slots in the opposite edges t ereof.

5. The combination with a4 blade-holding member of blades secured thereto and a channel bar shaped member connecting the blades, said member being` provided with a transversely-disposed slot.

In testimon)r whereof I affix mysignature in the presence of two witnesses.

MAX ROTTER. Witnesses:

FRANK E. DENNETT G. F. DE WEIN. 

